The core activity of the company TieRep consists of carrying out civil engineering work and repairs of construction machinery, particularly crawler excavators. The civil engineering work includes, among other things, work on steep slopes, pipeline trenches, slope stabilization, stream channeling, spring catchments, backfilling, construction of sewage systems, watercourse corrections, avalanche clearing, ski slope construction and anchor drilling. The repairs include on-site service, conversions and retrofits of construction machinery as well as repairs in the workshop.